If room temperature is 300K, is Gallium a solid, liquid, or gas?

Chemistry

1 answer:

disa [49]3 years ago

6 0

Answer:

Gallium is solid at 300K

Explanation:

X °C = 300 kelvin - 273.15 = 26.85 ° C

To know if Gallium is solid, liquid or gas; we should know the melting point of Gallium.

The melting point of gallium is 29.76 °C, which is 3 °C higher than the current temperature. This means it hasn't melted yet. So at 300 Kelvin, it is still solid. But the melting temperature is slightly above room temperature.

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Hydrogen iodide, HI, is formed in an equilibrium reaction when gaseous hydrogen and iodine gas are heated together. If 20.0 g of

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Answer: D. 19.9 g hydrogen remains.

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

a) moles of $H_2$

$\text{Number of moles}=\frac{20.0g}{2g/mol}=10.0moles$

b) moles of $I_2$

$\text{Number of moles}=\frac{20.0g}{254g/mol}=0.0787moles$

$H_2(g)+I_2(g)\rightarrow 2HI(g)$

According to stoichiometry :

1 mole of $I_2$ require 1 mole of $H_2$

Thus 0.0787 moles of $l_2$ require= $\frac{1}{1}\times 0.0787=0.0787moles$ of $H_2$

Thus $l_2$ is the limiting reagent as it limits the formation of product and $H_2$ acts as the excess reagent. (10.0-0.0787)= 9.92 moles of $H_2$ are left unreacted.

Mass of $H_2=moles\times {\text {Molar mass}}=9.92moles\times 2.01g/mol=19.9g$